Improvement in stqve-pipe-elbow machines



2 Sheets-Sheet 1.

J. s. LUGG. STOVE-PIPE ELBOW MACHINE.

Papennea 1/Lay1fs,1za"16` 2 Sheets--Slleet2.l

Jl s'l i *Y STOVE-PIPE ELBOW MACHINE.

N'o.177,408, 'Patented Ma.'y16,1876,`.

lime/afan To all whom it may concern;

,'PA'I'ENT OFFICE.

Y 'JOHN Lueon sPR'rNGFIELn-f 0Hio,v`AssIGnoR oF'trwo-THIRDS Ens .RIGHT TOWILSQN-G. 'BRYANT ANDVLAFAYETTE BANGROF'I, 0F SAME rieten..

4v'l'lvienioveiviENT"ln"eren/enelPla-ELBOW MACHINES.;-

"Specification forming part of Letters Patent No. 177,408, dated May 16, 18.76; application tiled March 21,1876.

` B e'f it'- known that I, JOHN S. LUGG, of Springfield, in the county of Clarke and State of Ohio, have invented a new and useful Improvement in Machines for Makin-g Stove-Pipe Elbows, of which the following is a specification: l

On the 8th day of April, 1873, Letters Patent of the United States No. 137 ,525 issued to Lafayette Bancroft for an improved sheetmetal elbow for stove and other pipes, made of sections of sheet metal connected by beads which extend only partially around the pipe, and by rivets or other suitable means.

The machine which is the subject of this application is especially adapted for joining the sections of such an elbow, though I do not limit the claims to this use of the machine.

My invention consists in a die, adapted for joining the sections by forming the beads in their overlapping edges and simultaneously heading the rivet which connects them, and in the combination of mechanism connected with the die.

In the annexed drawings, which a-re made part of this specification, Figure l is an ele'-n vation of the machine. Fig. 2 is an elevation, showing the horn and a vertical section of the die and operative mechanism. Fig. 3 is a plan and horizontal section. Fig. 4 is a plan, showing the eccentric cam which operates the sections of the clamp. Fig. 5 is a plan view ofthe sectional die. Fig; 6is a section, showing two of the sections of the pipe when prepared for the'action of the die and Fig. 7 is a similar section of the pipe, showing the bead and rivet after the action ofthe cam.

The same letters are employedin all the ligures in the indication of identical parts.

' A is the frame of the machine, which carries the operativeparts, and consisting of legs, abed, and columns, supporting the press mechanism. Ahorn, B, is bolted to the bed, and supports the expanding-die, having such curvature as adapts it for supporting the elbow as the sections are successively attached. The clamp C is also sustained by the bed by means of stems G1 attached to the respective sections ofthe clamp, which enter recesses in the bed formed to receive them. VA groove, G2, is

.cut in the inner faces ofthe sectional clamp at the angle in the middle intendedfio. receive the convex bead,'when it is formed in the sections of the elbow, when they arejoined. Another similar concavity, G3, is formed near the lower edge of the sections -of the clamp at a distance lfrom the concavity C2 corresponding face of the bed, andhaving an eccentric flange engaging inclined grooves across the stem G1 of the sectional clamp. It is turnedl by a lever, D1, by means of which the clamp may he expanded or contracted to permit the introduction or withdrawal of the elbow. Within the sectional clamp, and supported on the end of the horn B, is the expansible sectional die E. It is made in sections with radial edges, as shown in Fig. 5, and has a hole in the'center, where the sections converge. riphery of the die is a flat place, E1, having a concavity to form the head on the innerl end of the rivet, and a con vexity on the remainder, to form the bead on the elbow. ARadial slots cut in the sections of the die-receive pins F, which serve as guides and stops, and also containing spiral springs G, to retract the sections when released after being expanded. The die is expanded by means of a conical-pointed plunger, H, on a cross-head, H', hung between the ways I I, and actuated by a toggle-joint, K, operated by a treadle or otherconvenient power. The length of the clamp is that of two sections of the pipe, and its upper and lower edges conform in inclination to the bevel of the sections of the elbow.

The machine is operated as follows: The strips, having been cut to the proper shape, are bent and connected by punching the overlapping ends of the sections. The end section and the second section are then connected by hand,and pushed down through the clamp'un til the upper edge of the second section is opposite the edge of the clamp, and the joint is between the llet on the die and the recess in the middle of the clamp, the rivet being in place to be Onthe pelinched. The plungerHis then forceddown, xpanding the die, and forming the bead in he joint of the elbow, and compressing the ivet to form the head on the inner end. The lamp is then released, another section` at- '.lched, and let down until the bead formed be- Ween the first. two sections enters the lower acess U3, which thus forms a gage to fix the roper position of the succeeding section to reeive the bead. When all the sections have een completed the clampis opened, and the lbow taken off the horn.

What I claim as my invention, and desire i secure by Letters Patent, is-

1. The horn B, supporting the expanding-1 ie and the elbow as the sections are succesf vely attached, substantially as set forth.

2. The Vsectional clamp with grooves C2 C3 rranged in relation to one another, snbstam ally as set forth.

3. In combination, the sectional clamp with roove O2 and sectional expandng-die E, with peripheral convexity E2, for forming the bead,

and intermediate space El, with recess for beveled to correspond with theangle of the i sections ofthe elbow, substantially as set forth. In .testimony whereof I `have signed my name to this specification in the presence of twosubscribing witnesses. i

JOHN S.-LUGG.

Witnesses: i

D; P. YHoLLoWAY, A. RUPPERT. 

